function data=gen_ncl_sig(fudu, shijian,geshu)
    for j=1:geshu
        randf=fudu+fudu*(0.5-rand(1));
        randt=shijian+shijian*(0.5-rand(1));
        for i=(j-1)*1024+1:j*1024
            randz=50+50*(0.5-rand(1));
            if i<201+(j-1)*1024
                y(i)=0+randz;
            end
            if i>200+(j-1)*1024
                y(i)=(randf)*exp(((201+1024*(j-1))-i)/(randt))+randz;
            end
        end
    end
    data(1,:)=1:length(y);
    data(2,:)=y(:);
    data=data';
end


 
